UMOUNT NAS報錯No space left on device和was not found in /proc/mountsNAS_IP:/sysidc?表示NAS的存儲設(shè)備。?
[root@mvxl0280 /]# df -h?
Filesystem Size Used Avail Use% Mounted on?
/dev/mapper/VolGroup-lv_root 22G 20G275M 99% /?
tmpfs 7.8G 07.8G 0% /dev/shm?
/dev/sda1 485M 37M423M 9% /boot?
/dev/mapper/vg_01-lv_01 98G 72G21G 78% /eam_app?
NAS_IP:/sysidc 3.0T2.2T 743G 76% /mnt?
## mount命令不加參數(shù)顯示的結(jié)果和/etc/mtab文件記錄內(nèi)容一樣。?
[root@mvxl0280 /]# mount?
/dev/mapper/VolGroup-lv_root on / type ext4(rw)?
proc on /proc type proc (rw)?
sysfs on /sys type sysfs (rw)?
devpts on /dev/pts type devpts (rw,gid=5,mode=620)?
tmpfs on /dev/shm type tmpfs (rw)?
/dev/sda1 on /boot type ext4 (rw)?
/dev/mapper/vg_01-lv_01 on /eam_app typeext4 (rw)?
none on /proc/sys/fs/binfmt_misc typebinfmt_misc (rw)?
sunrpc on /var/lib/nfs/rpc_pipefs typerpc_pipefs (rw)?
NAS_IP:/sysidc on /mnt type nfs(rw,addr=NAS_IP)?
[root@mvxl0280 /]# cat /proc/mounts?
rootfs / rootfs rw 0 0?
proc /proc procrw,nosuid,nodev,noexec,relatime 0 0?
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime0 0?
devtmpfs /dev devtmpfsrw,nosuid,relatime,size=8157104k,nr_inodes=2039276,mode=755 0 0?
devpts /dev/pts devptsrw,relatime,gid=5,mode=620,ptmxmode=000 0 0?
tmpfs /dev/shm tmpfsrw,nosuid,nodev,relatime 0 0?
/dev/mapper/VolGroup-lv_root / ext4rw,relatime,barrier=1,data=ordered 0 0?
/proc/bus/usb /proc/bus/usb usbfsrw,relatime 0 0?
/dev/sda1 /boot ext4rw,relatime,barrier=1,data=ordered 0 0?
/dev/mapper/vg_01-lv_01 /eam_app ext4rw,relatime,barrier=1,data=ordered 0 0?
none /proc/sys/fs/binfmt_misc binfmt_miscrw,relatime 0 0?
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefsrw,relatime 0 0?
/etc/auto.misc /misc autofsrw,relatime,fd=7,pgrp=2080,timeout=300,minproto=5,maxproto=5,indirect 0 0?
-hosts /net autofs rw,relatime,fd=13,pgrp=2080,timeout=300,minproto=5,maxproto=5,indirect0 0?
NAS_IP:/sysidc /mnt nfsrw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=10.16.17.171,mountvers=3,mountport=1234,mountproto=udp,local_lock=none,addr=NAS_IP 0 0?


umount NAS存儲提示【No space left on device】?
[root@mvxl0280 ~]# umount /mnt?
can't create lock file/etc/mtab~9811: No space left on device (use -n flag to override)?
/mnt was not found in/proc/mounts?


NAS空間突然變小，從3.0T變成22G，其實此時看到的/mnt雖然掛載點是NAS“NAS_IP:/sysidc”，但其實是“/”目錄的掛載點。?
[root@mvxl0280 ~]# df -h?
Filesystem Size Used Avail Use% Mounted on?
/dev/mapper/VolGroup-lv_root 22G 20G346M 99% /?
tmpfs 7.8G 07.8G 0% /dev/shm?
/dev/sda1 485M 37M423M 9% /boot?
/dev/mapper/vg_01-lv_01 98G 72G21G 78% /eam_app?
NAS_IP:/sysidc 22G20G 346M 99% /mnt?
其實umount執(zhí)行之后，NAS存儲實際已經(jīng)成功umount，通過查看/mnt目錄就知道已經(jīng)是空的。?
[root@mvxl0280 ~]# ls -l /mnt?
total 0?
貌似是沒有卸載成功，但是此時再執(zhí)行一次帶【-f】的umount，依然報錯。?
[root@mvxl0280 ~]# umount -f /mnt?
/mnt was not found in/proc/mounts?
/mnt was not found in/proc/mounts?
重新mount NAS存儲也提示【No space left on device】?
[root@mvxl0280 /]# mount NAS_IP:/sysidc /mnt?
can't create lock file /etc/mtab~10608: Nospace left on device (use -n flag to override)?
網(wǎng)上說可以用umount的【-l】參數(shù)，其實也沒有效果。?
[root@mvxl0280 /]# umount -l /mnt/?
can't create lock file /etc/mtab~10512: Nospace left on device (use -n flag to override)?
can't create lock file /etc/mtab~10513: Nospace left on device (use -n flag to override)?
但是mount可以查看到NAS存儲“NAS_IP:/sysidc”已經(jīng)掛載在/mnt下。?
[root@mvxl0280 ~]# mount?
/dev/mapper/VolGroup-lv_root on / type ext4(rw)?
proc on /proc type proc (rw)?
sysfs on /sys type sysfs (rw)?
devpts on /dev/pts type devpts(rw,gid=5,mode=620)?
tmpfs on /dev/shm type tmpfs (rw)?
/dev/sda1 on /boot type ext4 (rw)?
/dev/mapper/vg_01-lv_01 on /eam_app typeext4 (rw)?
none on /proc/sys/fs/binfmt_misc typebinfmt_misc (rw)?
sunrpc on /var/lib/nfs/rpc_pipefs typerpc_pipefs (rw)?
NAS_IP:/sysidc on /mnt type nfs(rw,addr=NAS_IP)?
而/proc/mounts【/proc/self/mounts的軟連接】卻看不到掛載點信息，因此報錯【/mnt was not found in /proc/mounts】。?
[root@mvxl0280 ~]# ls -l /proc/mounts?
lrwxrwxrwx 1 root root 11 Feb 5 09:06 /proc/mounts -> self/mounts?
[root@mvxl0280 ~]# file /proc/mounts?
/proc/mounts: symbolic link to `self/mounts'?
[root@mvxl0280 ~]# ls -l /proc/self?
lrwxrwxrwx 1 root root 64 Feb 5 08:57 /proc/self -> 9879?
[root@mvxl0280 ~]# ls -l /proc/self/mounts?
-r--r--r-- 1 root root 0 Feb 5 09:07 /proc/self/mounts?
[root@mvxl0280 ~]# more /proc/self/mounts?
rootfs / rootfs rw 0 0?
proc /proc procrw,nosuid,nodev,noexec,relatime 0 0?
sysfs /sys sysfsrw,nosuid,nodev,noexec,relatime 0 0?
devtmpfs /dev devtmpfsrw,nosuid,relatime,size=8157104k,nr_inodes=2039276,mode=755 0 0?
devpts /dev/pts devpts rw,relatime,gid=5,mode=620,ptmxmode=0000 0?
tmpfs /dev/shm tmpfsrw,nosuid,nodev,relatime 0 0?
/dev/mapper/VolGroup-lv_root / ext4rw,relatime,barrier=1,data=ordered 0 0?
/proc/bus/usb /proc/bus/usb usbfsrw,relatime 0 0?
/dev/sda1 /boot ext4rw,relatime,barrier=1,data=ordered 0 0?
/dev/mapper/vg_01-lv_01 /eam_app ext4rw,relatime,barrier=1,data=ordered 0 0?
none /proc/sys/fs/binfmt_misc binfmt_miscrw,relatime 0 0?
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefsrw,relatime 0 0?
/etc/auto.misc /misc autofsrw,relatime,fd=7,pgrp=2080,timeout=300,minproto=5,maxproto=5,indirect 0 0?
-hosts /net autofsrw,relatime,fd=13,pgrp=2080,timeout=300,minproto=5,maxproto=5,indirect 0 0?
經(jīng)過對比分析，發(fā)現(xiàn)是“/”根目錄空間不足導(dǎo)致，而使用空間最多是一個/home/wasadmin/deploy的程序備份目錄，在跟開發(fā)人員確認(rèn)之后，這個目錄下的程序文件是定期備份，但是沒有部署相關(guān)的定期清理腳本，而導(dǎo)致空間被用完。?
[root@mvxl0280 home]# du -sh *?
60Kmonitor?
13Gwasadmin?
/home/wasadmin是用戶的home目錄，使用13G空間，而該目錄下只有2個常規(guī)目錄。其中client_ffdc這個目錄才204K。那么deploy占用了剩余的其他12G多的空間。?
[root@mvxl0280 home]# cd wasadmin?
[root@mvxl0280 wasadmin]# ls?
client_ffdcdeploy?
[root@mvxl0280wasadmin]# du -sh client_ffdc/?
204Kclient_ffdc/?


在刪除/home/wasadmin/deploy目錄下的部分備份程序之后，“/”目錄的空間已經(jīng)足夠，再次執(zhí)行umountNAS的命令，可以成功執(zhí)行。?
[wasadmin@mvxl0280 ~]$ df -h?
Filesystem Size Used Avail Use% Mounted on?
/dev/mapper/VolGroup-lv_root 22G 8.9G12G 45% /?
tmpfs 7.8G0 7.8G 0% /dev/shm?
/dev/sda1 485M 37M423M 9% /boot?
/dev/mapper/vg_01-lv_01 98G 68G26G 73% /eam_app?
NAS_IP:/sysidc 3.0T2.2T 743G 76% /mnt?
[root@mvxl0280 wasadmin]# umount /mnt?
[root@mvxl0280 wasadmin]# df -h?
Filesystem Size Used Avail Use% Mounted on?
/dev/mapper/VolGroup-lv_root22G 8.9G12G 45% /?
tmpfs 7.8G 07.8G 0% /dev/shm?
/dev/sda1 485M 37M423M 9% /boot?
/dev/mapper/vg_01-lv_0198G 68G26G 73% /eam_app??

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